In the field of construction materials, aluminum-plastic co-extruded profiles are widely used in various construction projects due to their excellent moisture-proof and corrosion-resistant properties. Liaoning MOHAN New Material Co., Ltd. focuses on the research and development and production of aluminum-plastic co-extruded profiles, the following is a detailed analysis of the principle of moisture and corrosion resistance of this type of material.

First, the material characteristics to build the foundation of moisture resistance and corrosion resistance

(i) the moisture-proof advantage of the outer plastic material

The outer layer of aluminum-plastic co-extruded profile is made of high-quality plastic material, such as polyvinyl chloride (PVC).PVC itself has good waterproof performance, and it is difficult for water molecules to penetrate its molecular structure. The moisture resistance of the plastic is further enhanced by the addition of specific additives during the production process. These additives fill in the tiny gaps between the plastic molecules to form a tighter structure, effectively blocking the intrusion of water. In addition, the plastic material itself does not absorb water, and will not absorb moisture in the air and swelling, deformation and other problems, so as to maintain the stability of the profile .

(ii) Corrosion resistance of aluminum alloy skeleton

The aluminum alloy skeleton inside the profile is the guarantee of its strength, and also plays an important role in corrosion resistance. The main component of aluminum alloy is aluminum, which reacts with oxygen in the air and generates a layer of dense aluminum oxide film on the surface. This layer of aluminum oxide film is thin, but the structure is close, can prevent oxygen and moisture further contact with the internal aluminum, thus preventing corrosion of aluminum alloy. Moreover, in the production process, aluminum alloy can also be anodized, electrophoretic painting and other surface treatment processes to further enhance its corrosion resistance. For example, anodic oxidation treatment can increase the thickness of the oxide film on the surface of aluminum alloy and improve its hardness and corrosion resistance; electrophoretic painting forms a layer of uniform and dense paint film on the surface of aluminum alloy, which can effectively isolate the corrosive medium from the outside world.

Structural design strengthens moisture-proof and corrosion-resistant performance.

(i) Multi-cavity structure to reduce moisture accumulation

Aluminum-plastic co-extruded profiles usually use multi-cavity structure design. Multiple independent cavities can not only enhance the thermal insulation performance of the profile, also has significant advantages in moisture. When outside moisture comes into contact with the surface of the profile, it is difficult for moisture to penetrate the profile directly into the room due to the complex airflow channels formed by the multi-cavity structure. Even if a small amount of moisture enters the interior of the profile, it will form a localized humidity environment in the cavity. And the cavities are independent of each other, preventing the spread of moisture in the profile inside a large area, reducing the impact of moisture on the overall performance of the profile .

(ii) Compact aluminum composite structure improves the anti-infiltration ability

Through a special co-extrusion process, aluminum-plastic co-extruded profiles achieve a close composite of aluminum alloy and plastic. This integrated structure eliminates the gaps that may exist in the traditional splicing method, and greatly improves the anti-penetration performance of the profile. Whether it is moisture or corrosive substances, it is difficult to penetrate from the aluminum-plastic combination into the interior of the profile, effectively avoiding the corrosion problems caused by penetration. At the same time, the tight composite structure also enhances the overall strength of the profile, so that in the face of moisture, corrosive environments, better able to maintain structural integrity.

(iii) reasonable drainage design to prevent water corrosion

In doors and windows and other applications, aluminum-plastic co-extruded profiles are usually equipped with a scientific and reasonable drainage system. For example, the profile is designed with specialized drainage holes, the location and size of these drainage holes are carefully calculated to ensure that in rainy days, the rainwater accumulated on the surface of the profile can be quickly and smoothly discharged. At the same time, part of the drainage system is also set up with a baffle plate or drainage groove to prevent rainwater from backing up into the interior of the profile, avoiding the risk of corrosion caused by the accumulation of water on the profile .

To sum up, the aluminum-plastic co-extruded profiles have achieved excellent moisture-proof and corrosion-resistant performance by virtue of their unique material characteristics and scientific structural design. Liaoning MOHAN New Material Co., Ltd. continuously optimizes the production process, improves the quality of products, and devotes itself to providing customers with aluminum-plastic co-extruded profiles with excellent performance, durability and reliability, to meet the needs of different construction projects in various environmental conditions.